box temperature solenoid valve will close
expansion valve will close
compressor will shutdown
king valve will open
第1题：
Low compressor head pressure in a refrigeration system can be caused by ___.
A.insufficient condenser cooling water
B.excessive condenser cooling water
C.air in the refrigeration system
D.excessive refrigerant in the system
第2题：
High diesel engine cooling water temperatures can be caused by ______.
A.air in the cooling system
B.an overhauled water pump
C.correct amount of coolant
D.no air in the cooling system
第3题：
What is head tank in the closed cooling water system used for?
A.for the release of air from the cooling water
B.providing expansion room for heated cooling water
C.a place for implementing water and water treatment agent
D.all of the above
第4题：
increase the flow of the cooling water through the condenser
adjust the high pressure cutout to maintain the desired pressure
open the hot gas bypass temporarily to reduce capacity
purge non-condensable gases to reduce the excess pressure
第5题：
insufficient condenser cooling water
excessive condenser cooling water
air in the refrigeration system
excessive refrigerant in the system
第6题：
Which of the following problems could cause the high pressure cutout switch to shut down the compressor in a refrigeration system?
A.A shortage of liquid refrigerant.
B.Excessive frost on the evaporator.
C.Excessive condenser cooling water.
D.Insufficient condenser cooling water flow.
第7题：
Why is it necessary to have routine testing of the cooling water?
A.To ensure that the proper residuals of treatment chemicals, as specified, are maintained all time
B.To trace leakage in the cooling water system
C.It is not necessary
D.To detect the presence of contaminants in the water that may be injurious to the cooling system
第8题：
If a refrigeration compressor is short cycling on high head pressure, you should
A.purge the condenser if the waterside is dirty
B.check for proper water flow through the condenser
C.increase the high pressure cutout setting
D.reduce the cooling water flow
第9题：
An open vent in the cooling system
A fouled sea chest
A restricted water passage in the engine
Air entrained in the cooling water
第10题：
fresh water expansion tank
sea water expansion tank
thermostatic expansion valve
jacket water cooler accumulator